William kl riley



w. M. RILEY July 29, 1930.

FIRE ALARM Filed Nov. 28, 1928 ammwtoz. ZJZ'ZZZ'amZYZz'Ze y ami/knewPatented July 29, 1930 UNITED STATES- wrm mm m. RILEY, or s'r.noursr/nssoum FIRE A ARM Application filed novemberas, 192s. Serial No.322,495.

The invention aims to provide an excep; 'tiona'lly simple andinexpensive, yet anefficient and reliable spring-actuated.fire alarmwhich is normally held against operation by a fusible link.

1 With the foregoing in view, the invention resides in the novel subjectmatter hereinafter described and claimed, description being accomplishedby reference to the accompanying drawing.

Fig. 1 is a perspective View of the complete alarm.

Fig. 2 is a fragmentary perspective view of a portion of thespring-actuated hammer-operating means and the means for normallyholding it against operation.

For the sake of simplifying explanatioii, the device will be describedand claimed as if used in a vertical position, it being understoodhowever that it may be advantageously employedin any other position ifdesired.

The numeral 3 denotes a rectangular back plate having openings 4 forattaching it to a support, the upper end of said back plate beingprovided with an upstanding neck 5 carrying a gong 6. Suitably mountedat the front side of. the back plate 3, is a spring actuated operatingmechanism 7 for a hammer 8, said mechanism employing the conventionalescapement arbor 9, the escapement 10 thereon and the spring-drivenescapement wheel 11 engaging said escapement. The hammer 8 is mounteddirectly on the arbor9 and this arbor is also provided with a laterallyprojecting arm 12 whose outer end 13 is preferably turned forwardly atright angles. This end 13 of the arm 12 is normally held by a fusiblelink which preferably consists of upper and lower wire hooks 1-l-15connected with each other by solder 16 or any other'fusible medium.

A casing 17 is provided for the mechanism 7. said casing being connectedwith the back plate 3 in a conventional manner and having ahammer-receiving slot 18 and another .slot 19 through which the arm 12projects. The casing 17 is also formed-with an opening 20 through .whicha key (notshown) may beinserted to wind the spring of'the mechanism .7.One vertical side of the casing is provided with a hook 21 engaged -bythe lower hook 15 of the fusible link, the upper book 14 of this linkbeing engaged with the arm 13.

Normally, the fusible link holds theentire alarm against operation butin case of fire in the vicinity of the alarm, the connection-16 ismelted. thereby releasing the arm 12 with the result that the hammer 8is actuated to sound the alarm.

Not only is the device of extreme simplicity, but it is efficient andreliable and is not liable to get out of order.

1. In a fire alarm, an escapement arbor, an escapement on said arbor, aspring-actuated escapement wheel operatively related with saidescapement, an alarm-actuating hammer directly secured to saidescapement arbor, a lateral arm also directly secured to said escapementarbor, a fusible link connected at one end with said arm, and an anchorfor the other end of said fusible link.

2. A fire alarm comprising a back plate having an upstanding portion, agong mounted on said portion, a sprin -dr1ven mechanism mounted at thefront side of said back plate and embodying an escapement arbor, anescapement on saidarbor and an escapement wheel engaging saidescapement, a hammer secured to and rising from said arbor, a horizontalarm secured directly to and projecting laterally in a horizontaldirection from said-arbor, a casing over said mechanism and detachablyconnected with said back plate, said casing having one slot in its topreceiving said hammer and another slot in a vertical side through whichsaid arm passes, the outer end of said arm'being bent forwardly at ri htangles and disposed in outwardly spaced parallel relation with said onevertical side of said casing, a rigid hook carried by this side of thecasing below said' forwardly bent arm end, and a fusible link' havinghooks at its ends, one of these hooks being engaged with said forwardlybent arm end and the other being engaged with said rigidhook.

In testimony whereof I have hereunto affixed my signature.

i i WILLIAM M. RILEY.

